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Production of mycelium biomass and ethanol from paper pulp sulfite liquor by Rhizopus oryzae
Dept. of Chem. Reaction Engineering, Chalmers University of Technology.ORCID iD: 0000-0003-4887-2433
Dept. of Chem. Reaction Engineering, Chalmers University of Technology.
Department of Clinical Bacteriology, Göteborg University.
Department of Clinical Bacteriology, Göteborg University.
2003 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 88, no 3, p. 167-177Article in journal (Refereed) Published
Abstract [en]

The cultivation conditions for Rhizopus oryzae grown in synthetic medium and paper pulp spent sulfite liquor (SSL) were investigated to achieve high biomass and ethanol yields using shake flasks and bioreactors. The fungus assimilated the hexoses glucose, mannose and galactose, and the pentoses xylose and arabinose as well as acetic acid which are present in SSL. The assimilation of hexoses was faster than pentoses during cultivation in a synthetic medium. However, all sugars were assimilated concomitantly during growth in SSL supplemented with ammonium, magnesium, calcium, phosphate, sulfate and trace amounts of some other metal ions (SSL-S). The medium composition had an important influence on biomass yield. The highest biomass yields, viz. 0.18 and 0.43 g biomass/g sugar were obtained, when the cells were cultivated in shake flasks with a synthetic medium containing glucose as carbon and energy source and SSL-S, respectively. The corresponding yields in a bioreactor with more efficient aeration were 0.22 and 0.55 g/g. In addition to the biomass, ethanol, lactic acid, and glycerol were important extracellular metabolites of the cultivation with maximum yields of 0.37, 0.30 and 0.09 g/g, respectively. When the source of sugars in the medium was exhausted, the fungus consumed the metabolites produced, such that the liquid medium was depleted of potential oxidizable nutrients. In general, there was a direct competition between lactic acid and ethanol among the metabolites. Poor medium compositions and cultivation conditions resulted in higher yields of lactic acid, whereas the ethanol and biomass yields were higher in rich media. SSL-S supported good growth of mycelium and a high ethanol yield.

Place, publisher, year, edition, pages
Elsevier Ltd , 2003. Vol. 88, no 3, p. 167-177
Keywords [en]
Ethanol, Hexoses, Lactic acid, Mycelium biomass, Pentoses, Rhizopus oryzae, Sulfite liquor
National Category
Industrial Biotechnology
Identifiers
URN: urn:nbn:se:hb:diva-14852DOI: 10.1016/S0960-8524(03)00010-5PubMedID: 12618037Scopus ID: 2-s2.0-0037411616ISBN: 09608524 (ISSN) OAI: oai:DiVA.org:hb-14852DiVA, id: diva2:1236335
Available from: 2018-08-01 Created: 2018-08-01 Last updated: 2018-08-08Bibliographically approved

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Taherzadeh, Mohammad J

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